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14.67. Set Up:
The heat energy generated by friction work equals the loss of kinetic energy. The heat
that goes
into the ice is related to the mass
of ice that melts by
For ice,
The
maximum amount of ice melts when the block loses all its kinetic energy and comes to rest.
Solve: (a)
For
and
Then
gives
(b)
For
and
Reflect:
Since the ice is at
any heat that goes into it causes a phase transition.
is 34 mph. When
brought to rest from this large initial speed only a very small fraction of the ice melts. Also note the irreversible
nature of this; the water won’t refreeze and release energy to get the block moving again.
14.68. Set Up:
For aluminum,
and
Solve:
At
the cube has volume
and density
At
the
volume is
V
and the density is
The mass
m
of the cube is constant.
and
Approximate
as
The density decreases by
14.69. Set Up:
Write the volume of the oceans as
where
d
is the average depth and
A
is the average
surface area of the oceans. Assume that only
d
changes when
V
changes, so
Solve:
and
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This note was uploaded on 03/06/2009 for the course PHYS 114 taught by Professor Shoberg during the Spring '07 term at Pittsburg State Uiversity.
 Spring '07
 Shoberg
 Energy, Friction, Kinetic Energy, Mass, Work, Heat

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